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Panda #21 — November 5, 2012Google rolled out their 21st Panda update, roughly 5-1/2 weeks after Panda #20. This update was reported to be smaller, officiallyimpacting 1.1% of English queries.Google Releases Panda Update 21, Impacts 1.1% Of US Queries In English (SEL)Official: Google Panda Refresh On November 5th (Version 21) (SER)Page Layout #2 — October 9, 2012Google announced an update to its original page layout algorithm change back in January, which targeted pages with too many adsabove the fold. Its unclear whether this was an algorithm change or a Panda-style data refresh.It’s “Top Heavy 2″ As Google Rolls Out Update To Its Page Layout Algorithm (SEL)Google Page Layout Algorithm Officially Updated (SER)Penguin #3 — October 5, 2012After suggesting the next Penguin update would be major, Google released a minor Penguin data update, impacting "0.3% of queries".Penguin update numbering was rebooted, similar to Panda - this was the 3rd Penguin release.Google Penguin Update 3 Released, Impacts 0.3% Of English-Language Queries (SEL)Google Released 3rd Penguin Update: Not Jarring Or Jolting (SER)August/September 65-Pack — October 4, 2012Google published their monthly (bi-monthly?) list of search highlights. The 65 updates for August and September included 7-resultSERPs, Knowledge Graph expansion, updates to how "page quality" is calculated, and changes to how local results are determined.Search quality highlights: 65 changes for August and September (Google)Exact-Match Domain (EMD) Update — September 27, 2012Google announced a change in the way it was handling exact-match domains (EMDs). This led to large-scale devaluation, reducing thepresence of EMDs in the MozCast data set by over 10%. Official word is that this change impacted 0.6% of queries (by volume).Googles EMD Algo Update - Early Data (SEOmoz)The EMD Update: Google Issues “Weather Report” Of Crack Down On Low Quality Exact Match Domains (SEL)Panda #20 — September 27, 2012Overlapping the EMD update, a fairly major Panda update (algo + data) rolled out, officially affecting 2.4% of queries. As the 3.X serieswas getting odd, industry sources opted to start naming Panda updates in order (this was the 20th).20th Google Panda Algorithm Update: Fairly Major (SER)How Do You Know If Google Panda Or EMD Hurt Your Site? (SER)http://www.seomoz.org/google-algorithm-change